Radon inhalation accounts for up to 14 percent of lung cancers worldwide.
The U.S. Environmental Protection Agency is joining the World Health Organization's first global call-to-action on cancer risk from radon in homes.

Two manufacturing companies will pay civil penalties and take corrective measures to settle Clean Air Act violations resulting from explosions at two plants in 2002 and 2003 in Louisville, Ky., and Pascagoula, Miss.